Vulnerability · Published Mar 16, 2026 · Assigned by Mattermost
CVE-2026-2476MS Teams plugin sensitive config values not properly masked in support packets
High 7.6
In plain English
A high-severity information exposure in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.6High
Exploit odds (30 days)0.2%top 91.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mattermost Plugins versions <=2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-plugin-msteams | 1.15.1-0.20260102165339-036c761bd3cb | GHSA-4ppj-6chv-5pgc |
| Go | github.com/mattermost/mattermost-plugin-msteams | 1.15.1-0.20260102165339-036c761bd3cb | GO-2026-4784 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 0 – through 2.0.3 |
Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N
References
- MMSA-2026-00606 vendor-advisory